/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.cassandra.service.snapshot;

import java.util.Set;
import javax.management.openmbean.CompositeDataSupport;
import javax.management.openmbean.CompositeType;
import javax.management.openmbean.OpenDataException;
import javax.management.openmbean.OpenType;
import javax.management.openmbean.SimpleType;
import javax.management.openmbean.TabularDataSupport;
import javax.management.openmbean.TabularType;

import org.apache.cassandra.io.util.FileUtils;

public class SnapshotDetailsTabularData
{
    private static final String[] ITEM_NAMES = new String[]{"Snapshot name",
                                                            "Keyspace name",
                                                            "Column family name",
                                                            "True size",
                                                            "Size on disk",
                                                            "Creation time",
                                                            "Expiration time",
                                                            "Ephemeral",
                                                            "Raw true size"};

    private static final String[] ITEM_DESCS = new String[]{"snapshot_name",
                                                            "keyspace_name",
                                                            "columnfamily_name",
                                                            "TrueDiskSpaceUsed",
                                                            "TotalDiskSpaceUsed",
                                                            "created_at",
                                                            "expires_at",
                                                            "ephemeral",
                                                            "raw_true_disk_space_used"};

    private static final String TYPE_NAME = "SnapshotDetails";

    private static final String ROW_DESC = "SnapshotDetails";

    private static final OpenType<?>[] ITEM_TYPES;

    private static final CompositeType COMPOSITE_TYPE;

    public static final TabularType TABULAR_TYPE;

    static
    {
        try
        {
            ITEM_TYPES = new OpenType[]{ SimpleType.STRING, SimpleType.STRING, SimpleType.STRING, SimpleType.STRING, SimpleType.STRING, SimpleType.STRING, SimpleType.STRING, SimpleType.STRING, SimpleType.LONG };

            COMPOSITE_TYPE = new CompositeType(TYPE_NAME, ROW_DESC, ITEM_NAMES, ITEM_DESCS, ITEM_TYPES);

            TABULAR_TYPE = new TabularType(TYPE_NAME, ROW_DESC, COMPOSITE_TYPE, ITEM_NAMES);
        }
        catch (OpenDataException e)
        {
            throw new RuntimeException(e);
        }
    }


    public static void from(TableSnapshot details, TabularDataSupport result, Set<String> files)
    {
        try
        {
            // in case of forcibly taken snapshots, ephemeral snapshot might get more sstables
            // which would inflate sizes which are otherwise cached,
            // hence, refresh sizes, but for ephemeral snapshots only
            String totalSize = FileUtils.stringifyFileSize(details.computeSizeOnDiskBytes(details.isEphemeral()));
            long trueSizeBytes = details.computeTrueSizeBytes(files);
            String liveSize =  FileUtils.stringifyFileSize(trueSizeBytes);
            String createdAt = safeToString(details.getCreatedAt());
            String expiresAt = safeToString(details.getExpiresAt());
            String ephemeral = Boolean.toString(details.isEphemeral());
            result.put(new CompositeDataSupport(COMPOSITE_TYPE, ITEM_NAMES,
                                                new Object[]{ details.getTag(), details.getKeyspaceName(), details.getTableName(), liveSize, totalSize, createdAt, expiresAt, ephemeral, trueSizeBytes }));
        }
        catch (OpenDataException e)
        {
            throw new RuntimeException(e);
        }
    }

    private static String safeToString(Object object)
    {
        return object == null ? null : object.toString();
    }
}
